Silo for loose material in powder form

Abstract

A silo for loose material in powder form having a base provided with a central conical section projecting upwards to form an annular discharge zone having floor portions inclined in a direction leading to an opening in a discharge chamber and in such manner that the material flows approximately tangentially towards the material discharge openings.

What is claimed is: 
     
       1. In a loose material silo having a cylindrical wall and a base the central region of which is formed by an upwardly projecting conical section, said base having a number of material discharge openings distributed symmetrically over its periphery between said conical section and said wall, said base having zones between the material discharge openings provided with loose material-supporting inclined surfaces, the improvement wherein said inclined surfaces are inclined peripherally of the silo and toward the material discharge openings in such manner that loose material may flow approximately tangentially of said zones of said base towards the respective material discharge openings. 
     
     
       2. A silo according to claim 1 wherein each of said material discharge openings communicates with a discharge chamber having side walls in which said openings are formed, each of said chambers being provided at its top with a cover. 
     
     
       3. A silo according to claim 2 wherein each of said discharge openings has an upper and a lower edge, and wherein each of said inclined surfaces extends from the cover of one discharge chamber to the lower edge of the discharge opening of an adjacent discharge chamber. 
     
     
       4. A silo according to claim 2 wherein each discharge chamber is provided with a material discharge opening in each of its side walls and wherein said base in each zone between adjacent pairs of discharge chambers has two downwardly inclined surfaces sloping downwards from between adjacent discharge openings to the lower edges of such adjacent material discharge openings. 
     
     
       5. A silo according to claim 2 wherein the covers of the discharge chambers are air permeable. 
     
     
       6. A silo according to claim 2 wherein each discharge chamber has an air vent connection in its upper region and a material extraction opening in its lower region. 
     
     
       7. A silo according to claim 1 wherein the inclined surfaces of said zones are air permeable. 
     
     
       8. A silo according to claim 1 including valve means for selectively opening and closing said discharge openings. 
     
     
       9. A silo according to claim 1 wherein said conical section of said base forms a chamber from which each of said discharge chambers is accessible. 
     
     
       10. A silo according to claim 1 wherein the material discharge openings extend in a radial direction from the conical section to the cylindrical wall. 
     
     
       11. A silo according to claim 1 wherein each inclined surface has an extension extending in prolongation thereof from an associated discharge opening to the associated discharge chamber. 
     
     
       12. A silo according to claim 1 wherein each discharge chamber has two discharge openings communicating therewith at opposite sides thereof, and wherein the inclined surfaces between peripherally adjacent discharge chambers slope in different directions so that loose material may pass approximately tangentially but in opposing peripheral directions through the material discharge openings of each discharge chamber. 
     
     
       13. A silo according to claim 12 wherein each material discharge chamber has two side walls and wherein a plurality of material discharge openings is provided in each side wall. 
     
     
       14. A silo according to claim 12 wherein each discharge chamber has a radially extending base inclined downwardly towards a radially directed central line and also is inclined downwards and radially inwards.